For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningDeployment Inside Vehicle - Vehicle Scrapping Procedure
Deploy the inflator modules inside of the vehicle when destroying the vehicle
or when salvaging the vehicle for parts. This includes, but is
not limited to, the following situations:
The vehicle has completed all useful life.
Irreparable damage occurred to the vehicle in a non-deployment ty ...
Prevailing Torque Fasteners
Prevailing torque fasteners create a thread interface between the fastener
and the fastener counterpart in order to prevent the fastener
from loosening.
All Metal Prevailing Torque Fasteners
These fasteners accomplish the thread interface by a designed distortion or
deformation in the fastene ...
Cruise Control
For vehicles with cruise control, the vehicle can maintain a speed of about 40
km/h (25 mph) or more without keeping your foot on the accelerator. Cruise control
does not work at speeds below 40 km/h (25 mph).
If the brakes are applied, the cruise control shuts off.
The vehicle has a Traction ...